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First applications of the ballistic model in femtosecond laser–matter interaction: Preliminary evidence of ac-run-away and new features about normal skin effect

Published online by Cambridge University Press:  09 April 2001

E. BÉSUELLE ,
D. TEYCHENNÉ  and
R.R.E. SALOMAA
E. BÉSUELLE
Affiliation:
Laboratoire de Physique des Milieux Ionises Ecole Polytechnique, F-91128 Palaiseau, France
D. TEYCHENNÉ
Affiliation:
Department of Engineering Physics and Mathematics, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Finland
R.R.E. SALOMAA
Affiliation:
Department of Engineering Physics and Mathematics, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Finland
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Abstract

The role of collisional absorption is supposed to be important in the beginning of the interaction between a laser pulse and matter. Later on, collective absorption phenomenons take place. The scope of this paper is to present first results about the so-called AC-run-away effect, defined as a “sudden transition from collisional absorption regime to a collective one.” For this purpose, we use a simple model based on ballistic theory. The delicate point concerning the Coulomb logarithm is also studied: we propose for it a convenient cutoff and an ensemble averaged Coulomb logarithm fit formula. Another application of the model presented here is the normal skin effect. We show some sensible differences between the present approach and those based on more common and rough collision frequency formulas.

Type
ULIA-1 CONFERENCE PAPERS
Information
Laser and Particle Beams , Volume 18 , Issue 3 , July 2000 , pp. 541 - 547
Copyright
© 2000 Cambridge University Press

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